package com.gcc.web;

import com.gcc.pojo.Book;
import com.gcc.pojo.Cart;
import com.gcc.pojo.CartItem;
import com.gcc.service.BookService;
import com.gcc.service.impl.BookServiceImpl;
import com.gcc.utils.WebUtils;
import com.google.gson.Gson;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class CartServlet extends BaseServlet {
    /**
     * 加入购物车
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    private BookService bookService=new BookServiceImpl();

    /**
     * 修改商品数量
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    protected void updateCount(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        int id=WebUtils.parseInt(req.getParameter("id"),0);
        int count=WebUtils.parseInt(req.getParameter("count"),1);
        //获取Cart购物车对象
        Cart cart = (Cart) req.getSession().getAttribute("cart");
        if(cart!=null)
        {
            //修改商品数量
            cart.updateCount(id,count);
            //重定向回商所在的地址页面
            resp.sendRedirect(req.getHeader("Referer"));
        }

    }
        protected void clearItem(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //获取购物车对象
        Cart cart= (Cart) req.getSession().getAttribute("cart");
        if(cart!=null)
        {//清空购物车
            cart.clear();
            //重定向回商所在的地址页面
            resp.sendRedirect(req.getHeader("Referer"));
        }

    }
        /**
         * 删除商品项
         * @param req
         * @param resp
         * @throws ServletException
         * @throws IOException
         */
    protected void deleteItem(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取商品编号
        int id=WebUtils.parseInt(req.getParameter("id"),0);
        //获取购物车对象
        Cart cart= (Cart) req.getSession().getAttribute("cart");
        if(cart!=null)
        {
            cart.deleteItem(id);
            //重定向回商所在的地址页面
            resp.sendRedirect(req.getHeader("Referer"));
        }

    }
        /**
         * 加入购物车方法
         * @param req
         * @param resp
         * @throws ServletException
         * @throws IOException
         */
    protected void addItem(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

       //获取请求的参数 商品编号
        int id= WebUtils.parseInt(req.getParameter("id"),0);
        //调用bookService.queryBookByid():Book D得到图书的信息
        Book book = bookService.queryBookById(id);
        //把图书信息转换成为CartItem商品项
        CartItem cartItem=new CartItem(book.getId(),book.getName(),1,book.getPrice(),book.getPrice());
        //调用cart.addItem(cartItem)添加商品项
        Cart cart= (Cart) req.getSession().getAttribute("cart");
        if(cart==null)
        {
            cart=new Cart();
            req.getSession().setAttribute("cart",cart);
        }
        cart.addItem(cartItem);
      //  System.out.println(cart);
        //最后一个添加的商品名称
        req.getSession().setAttribute("lastname",cartItem.getName());
        //重定向回商所在的地址页面
        resp.sendRedirect(req.getHeader("Referer"));
    }

    protected void ajaxAddItem(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //获取请求的参数 商品编号
        int id= WebUtils.parseInt(req.getParameter("id"),0);
        //调用bookService.queryBookByid():Book D得到图书的信息
        Book book = bookService.queryBookById(id);
        //把图书信息转换成为CartItem商品项
        CartItem cartItem=new CartItem(book.getId(),book.getName(),1,book.getPrice(),book.getPrice());
        //调用cart.addItem(cartItem)添加商品项
        Cart cart= (Cart) req.getSession().getAttribute("cart");
        if(cart==null)
        {
            cart=new Cart();
            req.getSession().setAttribute("cart",cart);
        }
        cart.addItem(cartItem);
        //  System.out.println(cart);
        //最后一个添加的商品名称
        req.getSession().setAttribute("lastname",cartItem.getName());
        Map<String,Object> resultMap = new HashMap<String,Object>();

        resultMap.put("totalCount", cart.getTotalcount());
        resultMap.put("lastName",cartItem.getName());

        Gson gson = new Gson();
        String resultMapJsonString = gson.toJson(resultMap);

        resp.getWriter().write(resultMapJsonString);
    }
}
